If you are thinking about getting into model railroading, there are some things you need to decide before you actually dive in.
Do you know what scale you want to model in?.
There are several different scales you can choose from. All of them have advantages and disadvantages, you have to decide what’s right for you. There is G scale ( basicly yhe size of Lionel, S scale, HO, HoN, TT, N and Z. You will want to fo a little research on all of these scales to find out what will best suit your needs.
To help with your decision, think about how much actual room you have to work with. If you live in an apartment, you probably want something smaller then G scale.
The other thing to think about., is where you are planning to set up your layout. The temperature and humidity plays and factor on where you want your layout.
Do you want to go with DC (direct current) or DCC (Diigital Comand Control) system to power your layout.
How much are you ready to invest in the hobby. It will cost more upfront to get started, but you dont need everything at once.
Do you have a specific era you want to model? What do you want your layout to look like? Ie: how big, layout plan.
These are the things you need to look into before investing any money into the hobby. Once you have decided, then its time to get started.